Wifi-based passive bistatic radar by using moving target indicator and least square adaptive filtering

Passive Radar is an emerging area of research that exploits existing illuminators of opportunity to detect targets. A number of researches have been investigating the use of digital transmissions (e.g. DAB, DVB-T, Wifi, WiMAX) as illuminator of opportunity, as well as analogue transmissions (e.g. FM radio or UHF television broadcast). In this paper we investigate a Wifi Based Passive Bistatic Radar architecture where it is used a computationally feasible approach based on a Least Square adaptive filter, a Moving Target Indicator filter and the suppression of Doppler and range sidelobes by using tapering windows. The LS approach is showed to perform the same performances of a FIR LMS adaptive filter. These encouraging performances obtained in a simulation environment and in a preliminary experiment, demonstrate the practicability of the described signal processing unit and the possibility to be used in a low cost passive radar system based on software-defined radio embedded systems.